238 



Rissoa incompta. T. minima, elongata, vitrea, lactea postiee 

 rubiginosa; anfr. 7 rotundatis, costis ad tres cinctis, longitudinaliter 

 inordinathn clathratis et indentatis, posticis carinatis : apertura cireu- 

 laris, peritremate simplici, incrassato. Long. 2; lat. 1 mtllim. Among 

 coral sand, Florida ; abundant. 



Rissoa (s. g. Setia) patens. T. rninuta, ovata, tenuis, vinosa,levis; 

 anfr. 5-G ventricosis, line;! subsuturali impressa ornatis : apertura 

 rotundata postiee emarginata; columella parum reflexa ; labro sub- 

 incrassato, fusco. Axis 3; diam. 2 millim. Hab. Fort Johnson, Charles- 

 ton Harbor, S. C. 



This minute Rissoid is remarkable for its large aperture and subsu- 

 tural impressed line. 



Mangelia (Astyris) LABECULA. T. parva, ovato-fusiformis, cerina, 

 macula castanea intra et extra labium ornata, spiraliter tenuissime 

 striata, longitudinaliter ad 1 6-plicata, plicis ad anfractum ultimum 

 sensim evanescentibus, striis simul crescentibus ; anfr. 7-8 convexius- 

 culis, linea subsuturali impressis : apertura parva, ovalis ; labro 

 gibboso, extus incrassato, intus granulato ; sinu baud notabili. Axis 

 7 ; diam. 3 millim. Dredged off the coast of Georgia. 



The brown blotch on the lip is a sufficient characteristic. 



I'.i.i.A UNDATELLA. T. ovato-rhomboidea, Iucida, lactea, nitida, 

 vix spiraliter striata ; apice mamillato ; anfr. 4 tabulatis (angulo rotun- 

 dato) linea subsuturali impressis, undulis opacis longitudinalibus ad 8 

 ornatis: apertura longitudine dimidiam testae adequans. Axis 3 ; diam. 

 1, 5 millim. Dredged in 400 fathoms oil' the coast of Georgia. 



The transparency and mamillated tip of this minute shell render 

 it plausible that it may be the young of some larger shell. 



MARGINELLA (s. g. Gibberula) laciiuimcla. T. minima, ovata, 

 lactea, Iucida, nitida, longitudinaliter exilissime striata; apice haud 

 eminente, vitreo : apertura anjiusta, crescentica ; labro obtuso, extror- 

 sum varicoso postiee late arcuato et apicem admodum superante, intus 

 vix crenulato; columella antice 4-plicata. Axis 1, 5 ; diam. 1 millim. 

 Dredged in 400 fathoms off the coast of Georgia. 



This may be distinguished from one or two other minute species 

 found in the W. Indies, by its transparency and its ventricose form. 



Semele nexilis. T. oblongo-ovalis, compressa, haud nitida, alba 

 versus umbones pallide incarnata concentrice laminato-striata et sulcis 

 radiantibus remotioribus concinne reticulata, ad intersectiones punc- 

 tata, et versus extremitatibus muriculata ; nmbonibus vix post medi- 

 anis; plicS baud profunda; dentibus lateralibus satis conspicuis ajque 

 ab umbone remotis ; pagina interiori erubescente. Long. 25; alt. 15; 

 lat. 7 millim. From the coast of Georgia. 



The sculpture is similar to that in the young of Lucina tigerina, but 

 much more delicate. 



